CIE iGCSE Co-Ordinated Science B18.2 Food chains and food webs Exam Style Questions Paper 1
▶️ Answer/Explanation
Producers are organisms that make their own organic nutrients through photosynthesis, using energy from sunlight. They are the first trophic level in food chains. Option B correctly defines a producer. Option A describes decomposers, option C describes consumers, and option D specifically describes herbivores, which are primary consumers.
✅ Answer: (B)
✅ Answer: (B)
▶️ Answer/Explanation
In the food chain, the tree is the producer as it makes its own food by photosynthesis.
The insect is a primary consumer (herbivore), the mouse is a secondary consumer (carnivore), and the owl is a tertiary consumer.
✅ Answer: (D)
The insect is a primary consumer (herbivore), the mouse is a secondary consumer (carnivore), and the owl is a tertiary consumer.
✅ Answer: (D)
▶️ Answer/Explanation
Carnivores are animals that obtain their nutrition by eating other animals; in the food web, kingfishers, perch, and water beetles all feed on other animals (not plants).
Tadpoles and freshwater shrimp feed on plants/algae making them herbivores, not carnivores.
✅ Answer: (A)
Tadpoles and freshwater shrimp feed on plants/algae making them herbivores, not carnivores.
✅ Answer: (A)
▶️ Answer/Explanation
The clues directly establish the chain: leaves (producer) → beetles (primary consumer/herbivore) → mice (secondary consumer, eating beetles) → owl (tertiary consumer).
Food chains always start with the producer and arrows point in the direction of energy flow, so the only correct sequence matching all four clues is: leaves → beetles → mice → owl.
✅ Answer: (B)
Food chains always start with the producer and arrows point in the direction of energy flow, so the only correct sequence matching all four clues is: leaves → beetles → mice → owl.
✅ Answer: (B)
▶️ Answer/Explanation
A producer makes its own organic nutrients using light energy through photosynthesis.
A consumer gets its energy by feeding on other organisms, and a decomposer gets its energy from dead or waste organic material.
Only one row in the table pairs an organism type with its precisely correct definition, with the others mixing up these roles.
✅ Answer: (D)
A consumer gets its energy by feeding on other organisms, and a decomposer gets its energy from dead or waste organic material.
Only one row in the table pairs an organism type with its precisely correct definition, with the others mixing up these roles.
✅ Answer: (D)